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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'add0ac5b63f20c4982829edaed1b444e2da2f4fde906a62afb24b1305cab20e9' 
  AND token = 'oQ6LuhWzdPKbL/chpmC+z2SgwAoaSIn235B6FKXl3/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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