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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79cb245e5498ae73f49ef9245f15733bad2b3a6d6550252b78f89c8d2117d8c5' 
  AND token = '7W1PONaN6n3JBS5CKQz98SjOyH8xFgrNSBJuO4SkqOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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