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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b6e30adeaab28f87adffb4367659e67f86f5d89194f4476fb0fc7108a151d5b' 
  AND token = 'eg2DWI+X1CfJ0O7COCNGfhSrGHX06aEdrBzCxkun5Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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