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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '54bcee39c889ee9e36fb118745cba9d82da70cb60e89a8a8ccfa785dfcdbdd99' 
  AND token = 'oAggbEtNUg25QRMoYp6HL8fHSSorUxmdsvYZSoVnjiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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