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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd60be05550667d2d80bd232735419e775b5e2d4b6fb9ac1ed8f0e5837bb4003' 
  AND token = 'BdIdV3FNA0HRrCkKuR1bXR5O6MSAN9xJTwIh7m3qFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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