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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc4dd2575dda7279521eed66aed3d4999fac4d3e9b7854963ef37ebe3203fac5' 
  AND token = '+4qLZWurgBioNyClwl3fl13BTPHfVg2Al7xBz2ci8ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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