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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '14eec2dec43730050aa6d8531e1c448d2a824aacaee5727cec42743457cebd40' 
  AND token = 'HI5vQfyMkFCypekChJ5ggJz+eNSCqdsc0n8lu1ZpTo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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