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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb8a53fe891015fa1fec694c880b724753b4e814d12a0ef957df29a15eda2452' 
  AND token = 'TEABmTMIAKw7wbjj88O2qcGgqi7/B7qEk80lEg+Uads=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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