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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1021f29b5819d1be9ee36e9b626e974f42a7986db72d439551be8d5f09f50f6e' 
  AND token = 'fj1L+dTapTQnqoG2fOggU0AX0uq4Y1gg820BzMu2SKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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