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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2518da130233d0816e56e10b829617b23e63d31feb74e5ce8434ec255876c51e' 
  AND token = 'X1/q3EQVi1q0rupOUlDouGlxn80lq+4jG+54qu2C1bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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