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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f83e148aff37d69ade35451a68801442ea83c2fccb4d9254cdad0ace594220c2' 
  AND token = 'hu3mex3itIkLflaFHgkNLM2EKZ24rOmBqCfp6z4OOfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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