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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60f184ada2f22a7d263eaa054abbf7bef8e65dc4f20fb89c2d118199bfb92a11' 
  AND token = 'NnR0AiUtgLQlG9jP+BVEdbg+FCft9CWsil2UU7HaLmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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