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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b9d1f73e3b2be370d559d582a0674dd583475f26415c5ad7075597fc3fdad33' 
  AND token = 'BJQKkVMFinfXd1Mjm2OstyrmpSO2kGZij2OiFMCxFMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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