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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6a7b3087788d2e58fc7ed707c6e39254374291f3bc07d1da7342753b7057fa76' 
  AND token = 'vWQTQyEUTAdS+mNGWrIYHoCfoVgVdvCzP+zdCIB8bk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}