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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34d247c007f607e5f8c1d20ec787b74d5f75c6c1e20faed46935d4bff07974d0' 
  AND token = 'oozcqgkR6c7Vm/0mKnIZwWhAU8phYQFisebneLF/rLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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