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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a0a50b6e6b99b91901e5f2cf10c94274cbe86b94941ded4ebe0090b560f3696' 
  AND token = 'agHLkhba/eWu0+/DopmjUFmrk+dl7ILd4E+Y9nmHKDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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