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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56e6749a5b5c3dbc850e9a1594aa86ee4d0f2618f2340dd00f892fdf07dc3258' 
  AND token = 'waufVdL4oQbNUkHpO0SU7Gwp1WKXU9iC5xzk1icl0L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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