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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2847e8351e971c02838559c0b190332294a33d6defb5c0824dc0a6c374e4d359' 
  AND token = '7TO6S7UcYhqQqr3fR9XQMNfaHNRNm1Y/fbeuR0+UnWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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