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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '006a1530c567a0d8e273b8b02cb42ecb81ac3efed25e464a3092aa450fa2da1d' 
  AND token = '7xYAiO3R0GEyaq5oW/07i43OrOIXDtdv9izp8nkSLj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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