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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '62a4d4c37719ee07d2e314a75e3358bdd240b9cc6e0d54e88e76fc3fb2d8077e' 
  AND token = 'cBOJTxu38Z7tnqM4AeM7M0RQJwA1qDz2w08F7u4VMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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