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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a2b8e0f951cdba4f64b2f8b3de6e2cf6f7e8c701ed33604132ebc02abf49445' 
  AND token = 'i4BV6Te/scCy/R5bT/jjGPZkhwHa67NaqtgLUd6DGuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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