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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dfb91680df85504dbc75fd8b96e171fbb0f2f20d561658cd4f5cd1b04754b379' 
  AND token = 'gsM3eef2XdPBS7o4seg1VHZyFLcXIfFSAGDZjudpk1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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