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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7dfc6ecad23b0f32acf5db563df81eb74682ec6ac3d57891069a274ee8bf327' 
  AND token = 'IXlmE6OF17fO94llXYGLAtemOlNo1qyzs6PEqoMIJ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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