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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07d850c63aeec6b7b48b47bbb9a745f74070ed2a32d2c6aa55439da01fbab293' 
  AND token = 'yXiI2WSEkBUKAVVA/GTsHN4rtmTGQYN4sr2AcoIvnPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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