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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd91f83949769bce62c2328f08db6b2c8dbb2b6b03c30bb18e93d75339b13db98' 
  AND token = 'ar3Ah649iV3Wv+ypns+IY7Y38o3/RbaLrUIt6GEvvD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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