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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5bd960eb99fce0d6066a27db5957143b90c0869c4aaa1c3a801a8b4c0f165d15' 
  AND token = '27ldH7/jRhEmbpi14O+7k0JgZ8ncKp2jaV2goea2jeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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