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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ec75510bd491f44773318588a6c09e773f2fe984f8b72358eefcf100c8d1e29d' 
  AND token = 'NbZ/n1m/sb98GBe39+5xF0Zb4Bu7D66flbdNnUcZs9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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