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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6f51fc52ffebd9db190697219371d178e11910416183c53b898ac0246ba6764a' 
  AND token = 'Nw7MHeFPUTVe0H4L3KmDMyAed3Rx9Cikeh6e2WUiWko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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