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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c4201dda73bba68a1b601680fcaa5cc096e2b22e66a318e2e7b27dcae55a0cc' 
  AND token = 'MJEtglt2MgbQ2HbdFcCBO/usxf1Q2zlQTRcERF0u6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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