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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9be01f299456feb02707e7080df7f4db86258adea1c999cf5f19b55082913898' 
  AND token = '481Z1xLxJ0WTKyTATCdgngCcSCa0EO5xTdhbYJdJlhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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