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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c4b2f02b1a90c997137d2face0925050a64b762339b9d98143753789649603ad' 
  AND token = 'wzvAA5Ya07wwL50nK7L9anSgRm/IXJ3jpSgYNxoo+0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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