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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1695946601e67e0bed669de85082ee04461eb71df03b61a1144cb685872b944a' 
  AND token = 'ME4nUBq28CKCo/Em0jv9hXnJfaKnVICxCT9fAaKhW6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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