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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6a570ceeed7a7ed34fac326987ae4a72e8bc0dc185da62e6a5ae7ede46ad933' 
  AND token = '6mdsP3mVQWe9l1o+geJouwX4q3RCCT3D/1dJzTR7Qdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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