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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbe2e703dfdb98fe2c86bc13802bb878d25adb237360f153a813613ab693226c' 
  AND token = '12BLPTpVHPS1vIdtFW7IqAhIyRrUrHHqphFMchwWKfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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