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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3f099554fe76ce6c94d75fd08da8d97322a4f0e07e16a3eedececa6e0358df3' 
  AND token = 'EHSLBkvCyyRw1u6aac59SP1KWUNfv9kFBx2rfv9tZ3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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