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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c8d7bd16dc3b07676ac0690c253c1910fe71d0cd364d76ecaec8a3ff3f6c67e' 
  AND token = 'ccHtq2sPYyceyr1SUjR9Ay32QBTkENlNCfb7LpPCaeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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