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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '108a4116830bc41c5f1ae4f3d7e9ea81184ce622a7be7d717c289a874dabe0c7' 
  AND token = '88SBJOrcIk4RKlVo8qu0xpowxrYWnfG8AGgFNHv3Hms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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