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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce0d283b26807e23af0918ec6c92df5db39b0cf85d95e26d3f37a1a0960c3137' 
  AND token = 'qizYQtKI7MZysC3Xw2668YBXo8guVBtE5195U5zrGm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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