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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c5a228d5f19eae7094c11cb3674f30dc32719ca12ca2b84c7995bdd37e4792fe' 
  AND token = 'nqVscV4rXHkFHqVr0Ykih7ac2q/lqareKRE/o1xP2yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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