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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e55037adfcb0f738676e879763ee9bd5fd7fb965bc0aa5ff4d061f0a3e47b80' 
  AND token = 'FlfIteYHCar7c2qB6x/HpZYvXJ5j1actQ83Ew2M0EHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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