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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6929ce228eee70927772a37c0b348c4b76e83bd7e10faa99984300b91a25391f' 
  AND token = 'ut7hz/H0BEPF4SkrwDBF8XZAp6rop+h69FDeFrFw/ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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