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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b559de456b554abf69162f4e63eb4fb32bdf26c0f9170b226e48d87ba5058523' 
  AND token = 'ktM/Snaen5qn7scDRf1MUxcdLqig5r5jfapSd3UUhRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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