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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5ff7905968afe0c039a8ed993e16b3278055defd9c5cf4d218355b06b258ed9' 
  AND token = 'B2YyrzOixQx04jdU5287PJB90s2diBuTggJJWLVdWYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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